218061843082447 has 64 divisors (see below), whose sum is σ = 274124182929408. Its totient is φ = 168871262400000.

The previous prime is 218061843082439. The next prime is 218061843082471. The reversal of 218061843082447 is 744280348160812.

It is a cyclic number.

It is not a de Polignac number, because 218061843082447 - 2³ = 218061843082439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218061843082391 and 218061843082400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218061843082427) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1514446197 + ... + 1514590177.

It is an arithmetic number, because the mean of its divisors is an integer number (4283190358272).

Almost surely, 2^{218061843082447} is an apocalyptic number.

218061843082447 is a deficient number, since it is larger than the sum of its proper divisors (56062339846961).

218061843082447 is a wasteful number, since it uses less digits than its factorization.

218061843082447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145400.

The product of its (nonzero) digits is 16515072, while the sum is 58.

The spelling of 218061843082447 in words is "two hundred eighteen trillion, sixty-one billion, eight hundred forty-three million, eighty-two thousand, four hundred forty-seven".